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Fri, 6 Mar 2026 15:41:33 -0800 From: Nicolin Chen To: , , , CC: , , , , , , , , , , , , Subject: [PATCH v3 2/3] PCI: Allow ATS to be always on for pre-CXL devices Date: Fri, 6 Mar 2026 15:41:16 -0800 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00002314:EE_|MN2PR12MB4128:EE_ X-MS-Office365-Filtering-Correlation-Id: b499e92e-f763-4f9c-4a23-08de7bd9f05c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|82310400026|1800799024|36860700016; X-Microsoft-Antispam-Message-Info: W2WV7QlWLaK/59di+i/v/PJmh1Q+J+rT8g0BDlt0pZrX1up3zPuceuGzaIJu9sRSN10nKzEEM5R5hKweMO2W/MTGxH7Tvt2b8TmFL5ww4sJ6YTriTVcV/xilyogxWi7EkjwgNqHEiTUt8dehy+qt3UZbqK8VE3YX/GwHYLCdS35z85VZwPIE0TKgZcMvNgDU5BWBpbmZakD/Nvq5nPP+m8/P/Ltg6D/3Z0X+JhFeRN6pLovSRs4c+R0m6k5JygyS5rK2INfmjGvxJ6/RPYOIIyk8c4h6XgX8xLGQJHzccHmaJ64EvFjJV8wplfl+IN2jdNbTepZ/PzGsVk+Lu9yEmsZeSkfD3DlkEFIQEGEMl5NU1l1bYTWLH2gGTbTaZllMyITq2fbp+cZcSlUWRLZ3oDdORRdUXEW5PAFUdGDcvAYzK+jcMP3Ug305q6Vs9GiCI+Nc2Xx7S0tAABbdgSldfaWIK94f0dRbyxXM9EyOA5q6BwHuoCtUO3X3TQQdZ7K9BiMDu67JhxRWLplB6Q34a2hNLDYoG8E24f/mCjsEuq5cQmgaeH5ZhDjNycA6aUuRYw13PlXI0A0+SkuobuI7T7RmxZozvSVyzyU2+lFMxaSIWwjLI2f3l6dgLZZRp5cB49owO4eiDGf2QoxxdfAZFTFbF7NxA2Z82TecIgnB+BelnnczWvpL+4eSs/6AgRmUtyHHGWsJoXunq/AonKloF4dcAx0hpuXN0N6E4wGDvM0HyJonfia0kdDX4y4YkNl3jrlqkHHZjFHyqWPbDjzzsQ== X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(7416014)(82310400026)(1800799024)(36860700016);DIR:OUT;SFP:1101; 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charset="utf-8" Some NVIDIA GPU/NIC devices, although don't implement the CXL config space, they have many CXL-like properties. Call this kind "pre-CXL". Similar to CXL.cache capaiblity, these pre-CXL devices also require the ATS function even when their RIDs are IOMMU bypassed, i.e. keep ATS "always on" v.s. "on demand" when a non-zero PASID line gets enabled in SVA use cases. Introduce pci_dev_specific_ats_always_on() quirk function to scan a list of IDs for these device. Then, include it pci_ats_always_on(). Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen Reviewed-by: Jason Gunthorpe Reviewed-by: Jonathan Cameron Reviewed-by: Kevin Tian Reviewed-by: Nirmoy Das Reviewed-by: Nirmoy Das Tested-by: Nirmoy Das --- drivers/pci/pci.h | 9 +++++++++ drivers/pci/ats.c | 3 ++- drivers/pci/quirks.c | 26 ++++++++++++++++++++++++++ 3 files changed, 37 insertions(+), 1 deletion(-) diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 13d998fbacce6..13fa71f965900 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -1150,6 +1150,15 @@ static inline int pci_dev_specific_reset(struct pci_= dev *dev, bool probe) } #endif =20 +#if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_PCI_ATS) +bool pci_dev_specific_ats_always_on(struct pci_dev *dev); +#else +static inline bool pci_dev_specific_ats_always_on(struct pci_dev *dev) +{ + return false; +} +#endif + #if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64) int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment, struct resource *res); diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index cf262eb6e6890..e6995b536ad4c 100644 --- a/drivers/pci/ats.c +++ b/drivers/pci/ats.c @@ -243,7 +243,8 @@ bool pci_ats_always_on(struct pci_dev *pdev) if (pdev->is_virtfn) pdev =3D pci_physfn(pdev); =20 - return pci_cxl_ats_always_on(pdev); + return pci_cxl_ats_always_on(pdev) || + pci_dev_specific_ats_always_on(pdev); } EXPORT_SYMBOL_GPL(pci_ats_always_on); =20 diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 48946cca4be72..21451e62f284e 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -5714,6 +5714,32 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x1457,= quirk_intel_e2000_no_ats); DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x1459, quirk_intel_e2000_no_= ats); DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x145a, quirk_intel_e2000_no_= ats); DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x145c, quirk_intel_e2000_no_= ats); + +static const struct pci_dev_ats_always_on { + u16 vendor; + u16 device; +} pci_dev_ats_always_on[] =3D { + /* NVIDIA GPUs */ + { PCI_VENDOR_ID_NVIDIA, 0x2e12, }, + { PCI_VENDOR_ID_NVIDIA, 0x2e2a, }, + { PCI_VENDOR_ID_NVIDIA, 0x2e2b, }, + /* NVIDIA CX10 Family NVlink-C2C */ + { PCI_VENDOR_ID_MELLANOX, 0x2101, }, + { 0 } +}; + +/* Some pre-CXL devices require ATS on the RID when it is IOMMU-bypassed */ +bool pci_dev_specific_ats_always_on(struct pci_dev *pdev) +{ + const struct pci_dev_ats_always_on *i; + + for (i =3D pci_dev_ats_always_on; i->vendor; i++) { + if (i->vendor =3D=3D pdev->vendor && i->device =3D=3D pdev->device) + return true; + } + + return false; +} #endif /* CONFIG_PCI_ATS */ =20 /* Freescale PCIe doesn't support MSI in RC mode */ --=20 2.43.0